Originally Posted by
schafphoto
I recently did a HABS project on 5x7 and found that my 240mm f9 Fujinon A (silver-ring, Copal 0 shutter, serial #521594) does get unsharp around the outer edges of the image circle. I'd say about and inch before the edge.
I was pushing the limits to get a clock tower into the frame at f22 and probably went past the "recommended" rise because I did not see the edge of the image circle.
My M.K. Davis chart on this lens says: Image circle 336mm - 5x7 rise in vertical for 71.73mm. Since my Cambo's front rise maxes out at around 90mm I had the capacity for error and made use of it.
I suggest you compose based on the numbers rather than the corners of the lens vignetting unless you have only sky in the top inch of your frame.
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